package com.xuecheng.test.rabbitmq;

import com.rabbitmq.client.*;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class Consumer {

    // 队列名称
    private static final String QUEUE = "helloWorld";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        // 设置RabbitMQ所在服务器的ip和端口
        factory.setHost("127.0.0.1");
        factory.setPort(5672);
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        // 声明队列
        channel.queueDeclare(QUEUE, true, false ,false, null);
        // 定义消费方法
        DefaultConsumer consumer = new DefaultConsumer(channel){
            /**
             * 消费者接收消息调用此方法
             * @param consumerTag 消费者的标签，在channel.basicConsume()去指定
             * @param envelope 消息包的内容，可从中获取消息id，消息routingKey，交换机，消息和重传标志
            (收到消息失败后是否需要重新发送)
             * @param properties
             * @param body
             * @throws IOException
             */
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope,
                                       AMQP.BasicProperties properties, byte[] body) throws IOException {
                // 交换机
                String exchange = envelope.getExchange();
                // 路由key
                String routingKey = envelope.getRoutingKey();
                // 消息id
                long deliveryTag = envelope.getDeliveryTag();
                // 消息内容
                String msg = new String(body, "utf-8");
                System.out.println("receive message.. " + msg);
            }
        };
        /**
         * 监听队列String queue, boolean autoAck,Consumer callback
         * 参数明细
         * 1、队列名称
         * 2、是否自动回复，设置为true为表示消息接收到自动向mq回复接收到了，mq接收到回复会删除消息，设置为false则需要手动回复
         * 3、消费消息的方法，消费者接收到消息后调用此方法
         */
        channel.basicConsume(QUEUE, true, consumer);
    }
}
